The filling was at the very least over ten years old and was very deep. My Newfoundland had chipped part of my tooth so it was filling and bonding. The nerve was dying as shown in the scan, which is why they wanted to do a root canal, thinking the burning would subside. The root canal made it worse, the dentist couldn't even touch my tooth, so he pulled it, thinking it was fractured. Turns out the nerve was affecting the tooth next to it. . The gum was burning but there was no inflammation according to the xrays. The burning was horrible but the tooth next to the extraction site was sore and hurt. The burning has been under control but the soreness of the tooth and in between the tooth next to it comes and goes. The burning I can not handle and I am always afraid it will come back.